Question on: JAMB Mathematics - 1998

Solve for the equation (\sqrt{x}) - (\sqrt{(x - 2)}) - 1 = 0

A
\(\frac{3}{2}\)
B
\(\frac{2}{3}\)
C
\(\frac{4}{9}\)
D
\(\frac{9}{4}\)
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Correct Option: D

(\sqrt{x}) - (\sqrt{(x - 2)}) - 1 = 0

= (\sqrt{x}) - (\sqrt{(x - 2)}) = 1

= ((\sqrt{x}) - (\sqrt{(x - 2)}))2 = 1

= x - 2 (\sqrt{x(x - 2)}) + x -2 = 1

= (2x - 3)2 = [2 (\sqrt{x(x - 4)})]2

= 4x2 - 12x + 9

= 4(x2 - 2x)

= 4x2 - 12x + 9

= 4x2 - 8x

4x = 9

x = (\frac{9}{4})

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